A strain-tunable quantum dot embedded in a nanowire antenna

P. E. Kremer, A. C. Dada, P. Kumar, S. Kumar, B. D. Gerardot

Research output: Contribution to journalArticle (Academic Journal)peer-review

45 Citations (Scopus)


We demonstrate an elastically-tunable self-assembled quantum dot in a nanowire antenna that emits single photons with resolution-limited spectral linewidths. The single-photon device is comprised of a single quantum dot embedded in a top-down fabricated nanowire waveguide integrated onto a piezoelectric actuator. Non-resonant excitation leads to static (fluctuating) charges likely at the nanowire surface, causing DC Stark shifts (inhomogeneous broadening); for low excitation powers, the effects are not observed and resolution-limited linewidths are obtained. Despite significant strain-field relaxation in the high-aspect-ratio nanowires, we achieve up to 1.2 meV tuning of a dot's transition energy. Single-photon sources with high brightness, resolution-limited linewidths, and wavelength tunability are promising for future quantum technologies.
Original languageEnglish
JournalPhysical Review B: Condensed Matter and Materials Physics
Publication statusPublished - 10 Nov 2014


  • cond-mat.mes-hall
  • physics.optics
  • quant-ph


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